mysql查询distinct和sum

Question

我有一个像这样的mysql字段：

url_id     time_spent
-------    ----------
120         14
120         97  
120         14
120         97 

我想基于url_id（DISTINCT）仅显示14和97。

Answer 1

select * from table group by url_id,time_spent

Answer 2

SELECT DISTINCT a.url_id, a.time_spent FROM table a